Movable table stand

ABSTRACT

A movable table stand is mainly composed of a table stand and two locking members. The table stand includes four corner plates, four adjustable restrictive rods, two direction-free wheels and two auxiliary wheels set at preset positions. Each of the corner plates is formed integral, able to avert mistakes of secondary machining and enforce the whole strength. The locking members are respectively set at a preset position at two sides of the table stand and controlled to keep the table stand locked or unlocked by treading with a foot. Being independent from locking system, the direction-free wheels and the auxiliary wheels can be processed mechanically and simply, reducing cost and increasing marketing competition.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a movable table stand, particularly to oneincluding four corner plates formed respectively integral for enforcingthe whole strength and locking members independent from wheels, reducingmachining complexity.

2. Description of the Prior Art

Common conventional movable stand, as shown in FIG. 1, is mainlyprovided with four corner plates 1, four adjustable fixing rods 2, twodirection-free wheels 3 and two auxiliary wheels 4. Each of the cornerplates 1 is formed of several plates welded together. The adjustablefixing rods 2 are respectively connected with one side of two cornerplates 1, assembled together with the corner plates to form a tablestand. The direction-free wheels 3 and the auxiliary wheels 4 are set atpreset positions around the table stand, enabling the table stand tomove freely with a load on it. Additionally, the auxiliary wheel 4 isprovided with a brake 5 so as to keep the table stand stopped steadilywhen the brake 5 is treaded by a foot. But, such a table stand, afterhaving been used for a period of time, is easily damaged because of thedegrading of the strength of the corner plates 1. Also, because each ofthe corner plates 1 is formed of several plates, welding work is extraneeded to finish it, increasing the manufacturing cost. And, the brake 5of the auxiliary wheel 4 has to be pushed manually with a great forcewhen the table stand is wanted to move, causing a very inconvenientoperation. So this invention has been devised to improve the defectsmentioned above.

SUMMARY OF THE INVENTION

The prime object of this invention is to offer a movable table standwith a better structure.

The main characteristics of the invention are two locking devicesprovided in a table stand. The table stand includes four corner plates,four adjustable restrictive poles, two direction-free wheels and twoauxiliary wheels. Each of the corner plates is composed of a triangularbottom plate and two side plates extended up vertically from two sidesof the bottom plate and formed integral, able to enforce the strengthand save a secondary machining process and reduce the cost forcompetition in marketing. The locking members are respectively set at apreset position at two front sides of the table stand and independentfrom four wheels set around the table stand, with the manufacturing costpossible to be reduced. In addition, being controlled to keep the tablestand locked or unlocked by treading with a foot, the locking memberscan be operated easily.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanyingdrawings, wherein:

FIG. 1 is perspective view of a conventional movable stand;

FIG. 2 is a perspective view of a preferred embodiment of a movabletable stand in the present invention;

FIG. 3 is a partial exploded perspective view of the preferredembodiment of a movable table stand in the present invention;

FIG. 4 is a perspective view of the material of a gusset in thepreferred embodiment of a movable table stand in the present invention;

FIG. 5 is a perspective view of a locking member of the preferredembodiment in the present invention, showing it in an unlockingcondition;

FIG. 6 is perspective view of the locking member of the preferredembodiment in the present invention, showing the locking member in alocked condition; and

FIG. 7 is a perspective view of the locking member of the preferredembodiment in the present invention, showing the locking memberrecovered from the locked condition to the unlocked condition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIGS. 2 and 3, a preferred embodiment of a movable tablestand in this present invention includes mainly a table stand 10 and twolocking devices 20.

The table stand 10 is composed of four corner plates 11, four adjustablerestrictive rods 12, two direction-free wheels 13 and two auxiliarywheels 14.

The cover plate 11, as shown in FIG. 4, possesses a triangular bottomplate 111 and two sideboards 112 extending up vertically from two sidesof the bottom plate 111. There are a preset number of fixing blocks 113pressed at the conjunction of the bottom plate 111 and each side plate112. The top of each side plate 112 is pressed to form a fixing groove114. A fixing hole 115 is bored at a preset position of each side board112, to be threadably engaged with a quick disassembling bolt 15, whichis composed of a fixing bar 151, an elastic spring 152, a sleeve 153 anda washer 154. A restrictive flange 155 is formed at a preset position inthe intermediate portion of the fixing bar 151. The elastic spring 152is to be fitted restricted around the fixing bar 151. Next, the fixingbar 151 is inserted into the sleeve 153, with the elastic spring 152,which is stopped by the restrictive flange 155, and simultaneouslyconfined in the sleeve 153. Finally, the outer portion of the fixing bar151 is screwed together with the washer 154, keeping the fixing bar 151confined in the sleeve 153 completely.

The adjustable restrictive rod 12 bored with a preset number of fixingholes 121 corresponding to the quick disassembling bolt 15 is to be putin the inner side of the fixing block 113 and the fixing groove 114 ofthe corner plate 11.

The direction-free wheels 13 are respectively screwed pivotally at apreset front position of the corner plate 11 at the front portion of thetable stand 10.

The auxiliary wheels 14 are respectively screwed pivotally at a presetposition beside the corner plate 11 at the rear portion of the tablestand 10.

The locking members 20 are fixed respectively at a preset positionbeside the corner plate 11 at the front portion of the table stand 10,consisting of a bottom base 21, a pedal 22, a restrictive plate 23, afixing base 24 and an outer cover 25 respectively.

The bottom base 21 is fixed at a preset position of the corner plate 11,with the pedal 22, the restrictive plate 23 and the fixing base 24orderly connected pivotally with its outer side, and a fixing pivot 211is fixed upright on the bottom base 21 in an intermediate portion.

The pedal 22 has a pedal plate 221 extending from its rear end andformed with an arced surface 222 formed at an underside of its front-endsection set with a restrictive projection 223 at a preset position. Inaddition, the pedal 22 is bored with a pivotal hole 224 in the front endsection at a preset position for fitting with a double-head rivet 225 tobe pivotally connected with the bottom base 21. The double-head rivet225 is matched with a twisting spring 226 fixed at the pedal 22 with itsone end and the bottom base 21 with the other end.

The restrictive plate 23 is provided with a fixing groove 231,corresponding to the fixing pivot 211 of the bottom base 21, and alocking surface 232 projecting on its upper side. In addition, therestrictive plate 23 is extended sidewise from its front to form a slope233 and bored with a pivotal hole 234 at its rear end for fitting with adouble-head rivet 235 to be pivotally connected with the bottom base 21.The double-head rivet 235 is matched with a torsion spring 236 fixed atthe restrictive plate 23 with its one end and the tail of the bottombase 21 with the other end.

The fixing base 24 is bored with a pivotal hole 241 at its front end forfitting with a double-head rivet 242 to connect pivotally with thebottom base 21. The double-head rivet 242 is matched with a torsionspring 236 fixed at the fixing base 24 with its one end and the bottombase 21 with the other end. In addition, from the bottom of the fixingbase 24 is extended outwards and vertically a flat fixing plate 244 forfitting with a braking block 246 screwed together with a screw nut 245at two sides of the fixing base 24 respectively.

The outer cover 25 is to be covered on the pedal 22, the restrictiveplate 23 and the fixing base 24 and riveted with the two double-headrivets 225 and 235 of the pedal 22, the restrictive plate 23 and thefixing base 24.

In using, as shown in FIGS. 2 and 3, the bottom plate 111 and the sideplate 112 of each corner plate 11 are formed integral as one unit,providing a large strength for heavy loading. The direction-free wheels13 can be moved in a controlled direction. As shown in FIGS. 5 and 6,they depict how the movable table stand in this invention is stoppedsteadily by the brake. First, the pedal 22 of each fixing member 20 mustbe treaded by foot to enable the arced surface 222 at the bottom of thepedal 22 to rotate against the double-head rivet 225 and the torsionspring 225, then, to be compressed to sustain a rebounding force. Bythis time, the arced surface 222 is to enable the fixing base 224beneath it to rotate against the double-head rivet 242 and the torsionspring 243 to be compressed to sustain a rebounding force. The fixingbase 24, after being rotated, is to keep the braking block 246 moveddownwards so as to lift up the direction-free wheel 13 from the groundand stay steadily and immovable on the ground. Simultaneously, therestrictive projection 223 of the pedal 22 is to move along the lockingsurface 232 of the restrictive plate 23, which is to rotate downwardsagainst the double-head rivet 235 so as to compress the torsion spring236 to sustain a rebounding force. When the restrictive projection 223moves over the locking surface 232, it will be restricted by the lockingsurface 232 and the slope 233, achieving a steady stopping for themovable table stand in this invention.

On the contrary, as shown in FIG. 7, if the movable table stand is to bemoved, the pedal 22 must be treaded by foot to enable the restrictiveprojection 223 of the pedal 22 to move ahead slightly to the tip of theslope 233 of the restrictive plate 23 and further into the inner side ofthe slope 233. By this time, because of the loosening of the torsionspring 236, the restrictive plate 23 will rebound back to stay stoppedowning to the fixing pivot 211 of the bottom base 21 fitting in andrestricting the fixing groove 231. Then, the pedal 22, being no morerestricted by the restrictive plate 23, will rebound because of theloosening of the torsion spring 226. Next, the fixing base 24 will aswell rebound with its own rebounding force, enabling the braking block246 to rise up from the ground and the wheels 13 to touch the ground andable to move.

Finally, the advantages of the movable table stand are listed as below:

1. Each of the corner plates 11 is formed as an integral unit, enforcingits strength, averting any mistake caused by secondary machining and toreduce the cost, enhancing practicality and marketing competition.

2. Each of the locking members 20 is set at a preset positionindependently, able to reduce the machining complexity for thedirection-free wheel 13 and the auxiliary wheel 14, and is to controlstopping and moving actions by direct treading with foot providing aconvenient operation.

While the preferred embodiment of the invention has been describedabove, it will be recognized and understood that various modificationsmay be made therein and the appended claims are intended to cover allsuch modifications that may fall within the spirit and scope of theinvention.

1. A movable table stand comprising: a table stand having four cornerplates, four adjustable restrictive poles, two direction-free wheels andtwo auxiliary wheels; each said corner plate possessing a triangularbottom plate and two side plates extending up vertically from two sidesof said bottom plate, plural fixing blocks pressed at the conjunction ofsaid bottom plate and each of said side plates, each said side boardpressed to form a fixing groove at its top and bored with a fixing holeat a preset position for fitting with a quick disassembling bolt; eachsaid adjustable restrictive rod bored with a preset number of fixingholes corresponding to said quick disassembling bolts and to be put inthe inner side of said fixing block and said fixing groove of saidcorner plate; said direction-free wheels respectively screwed pivotallyat a preset front position of said corner plates at the front portion ofsaid table stand; said auxiliary wheels respectively screwed pivotallyat a preset position beside said corner plates at the rear portion ofsaid table stand; two locking members fixed respectively at a presetposition beside said corner plates at the front portion of said tablestand and respectively having a bottom base, a pedal, a restrictiveplate, a fixing base and an outer cover; said bottom base fixed at apreset position of said corner plate, said pedal, said restrictive plateand said fixing base orderly and pivotally connected with an outer sideof said bottom base, a fixing pivot fixed at a preset position sidewiseon said bottom base; said pedal having pedal plate extending from itsfront end and an arced surface formed at its rear end and set with arestrictive projection at a preset position and bored with a pivotalhole at a preset position for fitting in with a double-head rivet forconnecting pivotally with said bottom base, said double-head rivetmatched with a torsion spring fixed at said pedal with its one end andsaid bottom base with the other end; said restrictive plate having afixing groove corresponding to said fixing pivot of said bottom base andprovided with a locking surface at its upper side, a slope extendingsidewise from its front and a pivotal hole bored at its end for fittingwith a double-head rivet for connecting pivotally with said bottom base,said double-head rivet matched with a torsion spring fixed at saidrestrictive plate with its one end and the tail of said bottom base withthe other end; said fixing base bored with a pivotal hole at its frontend for fitting in with a double-head rivet for connecting pivotallywith said bottom base, said double-head rivet matched with a torsionspring fixed at said fixing base with its one end and said bottom basewith the other end, said fixing base having a fixing plate extendingoutwards and vertically on its bottom for fitting with a braking blockscrewed together with a screw nut at two sides of said fixing baserespectively; and, said outer cover covered on said pedal, saidrestrictive plate and said fixing base and riveted with each of said twodouble-head rivets of said pedal, said restrictive plate and said fixingbase.
 2. A movable table stand as claimed in claim 1, wherein said quickdisassembling bolt is composed of a fixing bar, an elastic spring, asleeve and a washer; said fixing bar has a restrictive flange in theintermediate portion, said elastic spring is fitted around said fixingbar that is successively inserted into said sleeve, so that said elasticspring, being stopped by said restrictive flange, is confined in saidsleeve, and the outer portion of said fixing bar is screwed togetherwith said washer.